Class 7 Science Chapter 18 MCQ

Class 7 Science Chapter 18 MCQ (Multiple Choice Questions) of Wastewater Story in English Medium updated for CBSE Session 2021-2022. All the questions are important and useful of terminal exams and class tests.

MCQs are design in such a way it covers the entire chapter 18 of class 7 science. There are about 60 questions in all divided into 10 MCQ online tests.

Class 7 Science Chapter 18 MCQ for 2021-2022

Class: 7Science
Chapter: 18Wastewater Story
Contents: MCQ Online Quiz with answers

MCQ Tests with Answers for Class 7 Science Chapter 18


Consider the following statements and choose the incorrect one:

[A]. Clean water is a basic necessity of our life.
[B]. The wastewater may also contain pieces of human excreta.
[C]. Use water or waste water could not be reused after cleaning it.
[D]. The cleaning of water is a process of removing pollutants harmful substances from it.

Which of the following statement is or are incorrect?

[A]. The wastewater and faeces from homes and other buildings which is carried away in sewers, is called sewage.
[B]. The bacteria present in sewage include those bacteria which cause water-borne diseases such as cholera and typhoid.
[C]. An underground pipe which carries away dirty drainage water and waste water, is called a sewer.
[D]. None of the above.

Rupali is writing some statements, choose the incorrect statement and help her:

[A]. The sewage released by houses and other buildings contain a large number of harmful substances and a disease-causing microorganism.
[B]. Drinking of water contaminated with sewage, spread disease in people which can even lead to death.
[C]. The discharge of untreated sewage into rivers can also kill fish and other aquatic animals.
[D]. None of the above.

Open drain system is a breeding place for which of the following?

[A]. Flies
[B]. Mosquitoes
[C]. Organisms which cause disease
[D]. All the above

Read the following sentences carefully, and choose the incorrect one:

[A]. Use water is waste water which can be recycled.
[B]. Wastewater is treated in a sewage treatment plant.
[C]. By products of wastewater treatment are sludge and biogas.
[D]. Sewage is a liquid waste which causes water pollution.


Water polluted by various human activities cause a number of water-borne diseases. Which of the following is not a water-borne disease?

[A]. Cholera
[B]. Typhoid
[C]. Asthma
[D]. Dysentry

Pick from the following one chemical which is used to disinfect water?

[A]. Chlorine
[B]. Washing soda
[C]. Silica
[D]. Coal

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

[A]. Sewers
[B]. Sewerage
[C]. Transport system
[D]. Treatment plant

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Bacteria which can grow and multiply in absence of free oxygen are called anaerobic bacteria.
[B]. Water which is cleared from the floatable substances like oil and grease by a skimmers is called clarified water.
[C]. Waste water solids like faeces, which settle down at the bottom of a large tank and are removed with a scraper are called sludge.
[D]. None of the above.

The full form of WWTP is:

[A]. World Wide Transport Programme
[B]. Waste Water Treatment Plant
[C]. World Workers’ Talent Programme
[D]. None of these.


Which is used in vermi processing toilets?

[A]. Cockroaches
[B]. Earthworms
[C]. Snail
[D]. Silkworms

In a filtration plant, water is filtered using layers of:

[A]. Sand and clay
[B]. Clay and fine gravel
[C]. Sand and fine gravel
[D]. Sand, fine gravel and medium gravel

Select the one that is incorrect for wormy processing toilet:

[A]. It is a new method and has been recently tested in India.
[B]. In it the human excreta are treated by cockroaches and round worms.
[C]. In it the human excreta are completely converted into vermi-cakes.
[D]. It is an ideal, low water use toilet that is safe for processing of human waste.

Which of the following is a good practice be followed?

[A]. Cooking oil and paint should not be thrown down a drain.
[B]. Used tea leaves, solid food and cotton should not be thrown in the drain.
[C]. Chemicals like insecticides should not throw in the drain.
[D]. All of the above

Which of the following statements about ozone are correct?

[A]. It is essential for breathing of living organisms and it is used to disinfect water.
[B]. It is used to disinfect water and it absorbs ultraviolet rays.
[C]. It is essential for breathing of living organisms and it absorbs ultraviolet rays.
[D]. It is used to disinfect water and its proportion in air is about 3%.


The General Assembly of United Nation on the World Water Day on 22nd march 2005 has declared the period as the international decade for action on:

[A]. Water for Life
[B]. Nature for Water
[C]. Water and Disaster
[D]. Water for Future

“By providing clean water and sanitation to the poorest people on the planet, we can reduce poverty and suffering and ensure education for all children.”— said by:

[A]. International Labour Organisation (ILO)
[B]. International Monetary Fund (IMF)
[C]. Food and Agricultural Organisation (FAO)
[D]. United Nations International Children’s Emergency Fund (UNICEF)

In this year board examination, Ajju were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. World Water Day 2020, on 22 March, is about water and climate change.
[B]. The theme of 2019 was about tackling the water crisis by addressing the reasons why so many people are being left behind
[C]. In 2017, the theme was “Why Waste Water?” which was about reducing and reusing wastewater.
[D]. All the above

Durgesh is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. Waste cooking oils and fats should not be thrown in the kitchen sink to go down the drain.
[B]. The climate like paints, solvents, insecticides, medicines and motor oil etc., should not be thrown down the drain.
[C]. The wastes such as solid food remains, used tea leaves, sanitary towels, polythene bags used cotton, hair etc., should not be thrown the drains.
[D]. All the above

Which of the following is not a water-borne disease?

[A]. Cholera
[B]. Tuberculosis
[C]. Typhoid
[D]. Dysentery


Which of the following statement is or are incorrect?

[A]. All the portable toilets are chemical toilets.
[B]. Septic tanks and composting pits are called on-site sewage facility.
[C]. Septic tanks are suitable for those places where there is no sewage system.
[D]. The human waste can not be used in a biogas plant for making biogas.

The examples of onsite sewage disposal system for human waste are:

[A]. Septic tanks
[B]. Composting pits and
[C]. Chemical toilets.
[D]. All the above

Vacuum toilets are usually used in:

[A]. Superfast trains
[B]. Cinema halls
[C]. Aeroplanes
[D]. Large ships

Consider the following statements and choose the correct one:

[A]. We should never urinate on the roadside.
[B]. We should not spit in public places.
[C]. After eating a banana, we should not throw banana peels on the road side.
[D]. All the above

Which of the following are used for the safe disposal of human excreta in those areas where sewerage system does not exist and water supply is limited or not available at all?

[A]. Chemical toilets
[B]. Vacuum toilets
[C]. Septic tank toilets
[D]. Composting toilets

Download App for Class 7


Feedback and Suggestion

Provide your suggestion and feedback to improve the content of website. We work on suggestion received by the uses. We always respect your suggestion and work on feedback also.